Method for preparing potassium fluoride

A technology of potassium fluoride and ammonium fluoride, applied in the direction of alkali metal fluoride, etc., can solve the problems of rising hydrofluoric acid price and affecting the production cost of potassium fluoride

Inactive Publication Date: 2009-03-04
DO FLUORIDE CHEM CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

The traditional method of producing potassium fluoride mostly uses potassium carbonate or potassium hydroxide - hydrofluoric acid method. Hydrofluoric acid is mainly produced by the reaction of fluorite and sulfuric acid. The traditional process needs to consume a valuable strategic resource - fluorite. Now the country Increase the control of fluorite, the price of f

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  • Method for preparing potassium fluoride

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Embodiment 1

[0020] The method for preparing potassium fluoride in this embodiment uses ammonium fluoride and potassium hydroxide as main raw materials, and specifically comprises the following steps:

[0021] (1) Pour 20% ammonium fluoride solution into the reaction kettle, start stirring, add the required solid potassium hydroxide in an amount of 1.10 times ammonium fluoride at a uniform speed, the pH value at the end of the reaction is 8, and the reaction is put Thermal reaction, after the reaction, the temperature reaches above 110°C; the water vapor is cooled, gas-liquid separation, and the liquid enters the condensation tank; the gas is absorbed into ammonia water through the cooling cycle, enters the storage tank, and the rest of the gas is emptied;

[0022] (2) After the reaction in the reactor is complete, the liquid flows into the concentration tank, the concentrated water vapor is cooled and separated from gas and liquid, and the liquid enters the condensation tank; the gas is co...

Embodiment 2

[0026] The method for preparing potassium fluoride in this embodiment uses ammonium fluoride and potassium hydroxide as main raw materials, and specifically comprises the following steps:

[0027] (1) Pour 30% ammonium fluoride solution into the reaction kettle, start stirring, add the required solid potassium hydroxide according to the addition of 0.9 times of ammonium fluoride at a uniform speed, the pH value at the end of the reaction is 7.5, and the reaction is Exothermic reaction, after the reaction, the temperature reaches above 110°C; the water vapor is cooled, gas-liquid separation, and the liquid enters the condensation tank; the gas is absorbed into ammonia water through the cooling cycle, enters the storage tank, and the rest of the gas is evacuated;

[0028] (2) After the reaction in the reactor is complete, the liquid flows into the concentration tank, the concentrated water vapor is cooled and separated from gas and liquid, and the liquid enters the condensation t...

Embodiment 3

[0033] The method for preparing potassium fluoride in this embodiment uses ammonium fluoride and potassium hydroxide as main raw materials, and specifically comprises the following steps:

[0034] (1) Put 40% ammonium fluoride solution into the reaction kettle, start stirring, and add solid potassium hydroxide in the reaction kettle at a uniform speed. The pH value at the end of the reaction is 8.0. This reaction is an exothermic reaction. After the reaction, the temperature reaches Above 110°C; water vapor is cooled, gas-liquid separated, and the liquid enters the condensation tank; the gas is absorbed into ammonia water through the cooling cycle, enters the storage tank, and is used for standby, and the rest of the gas is emptied;

[0035] (2) After the reaction in the reactor is complete, the liquid flows into the concentration tank, the concentrated water vapor is cooled and separated from gas and liquid, and the liquid enters the condensation tank; the gas is cooled and ab...

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Abstract

The invention relates to a method for preparing potassium fluoride, which takes ammonium fluoride and potassium hydroxide as main raw materials and concretely comprises the steps as follows: (1) an ammonium fluoride solution is injected into a reaction kettle which then starts to stir, the potassium hydroxide is added in uniform speed, and the pH value is 7.5 to 8.0 at a reaction end point; (2) after the reaction in the reaction kettle is complete, liquid flows into a concentration tank automatically; (3) a potassium fluoride solution which is concentrated is injected into a transferring tank and then is injected into a spray drying tower for drying from the transferring tank; (4) water vapor and fine dust are dried and processed through cyclone separation and cooling for gas-liquid separation; the liquid enters into a receiving tank, and the gas is processed through secondary absorption; the absorbed liquid enters in the receiving tank, and water vapor is evacuated. Because fluosilicic acid is a by-product of a phosphate fertilizer factory, the cost is lower and the material is easy to get, thereby greatly lowering the manufacturing cost of the potassium fluoride. Ammonia gas which is generated during the reaction process in the method is recycled through a closed cycle completely, so the environmental protection pressure is reduced and the manufacturing cost is lowered to a certain extent. The method has good social benefit, economic benefit and environmental protection benefit, and is easy to be popularized and applied.

Description

technical field [0001] The invention relates to a method for preparing potassium fluoride, in particular to a method for preparing potassium fluoride with ammonium fluoride and potassium hydroxide as main raw materials. Background technique [0002] Potassium fluoride has a wide range of uses, mainly used as a welding flux for various metals and alloys; it is widely used as a fluorinating agent in the production of organic compounds; it is used in the production of sodium fluoroacetate and fluoroacetamide pesticides in pesticides; it is used in medicine to make norfloxacin; in addition, it can be used as an absorbent (absorbing HF and moisture), and is also a raw material for the preparation of potassium bifluoride, and can also be used for glass carving and food preservation. [0003] The related industries that use potassium fluoride have a stable scale and a stable demand for potassium fluoride. Especially since the beginning of this century, with the rapid development of...

Claims

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Application Information

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IPC IPC(8): C01D3/02
Inventor 皇甫根利李世江侯红军杨华春刘海霞张良
Owner DO FLUORIDE CHEM CO LTD
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